Motor compressor unit



May 23, 1933. c E. PLOEGER ET AL 1,910,498

MOTOR COMPRESSOR UNIT Filed Jan. 50, 1931 3 Sheets-Sheet l May 23, 1933.

cl E. PLOEGER ET AL MOTOR COMPRESSOR UNIT Filed Jan. 50 1931 NVNTRS IATTORNEY May 23, 1933.

C. E. PLOEGER ET AL MOTOR COMPRESSOR UNIT Filed Jan. 30-, 1951 5Sheets-:Sheefl 5 58 paw CLYDE EDWARD PLOEGER,

Patented May 23, 1933 VILLE, INDIAlfl'A, ASSIGNORS TO OF DELAWARE IALVIN E. BURGESS, AND WALTER vA. KUENZLI, OF EVANS- SERVEL INQ, OF NEWYORK, N. Y., A CORPORATION MOTOR COMPRESSOR UNIT Application filedJanuary 30, 1931.

This invention relates to compressors and more particularly tomotor-compressor units for use inmeehanical refrigerating systems.

The invention is herein described in connection with an hermeticallysealed motor-compressor unit for use in a refrigerating system of thecompression type. It is desirable that a unit of this character be quietin operation, compact and'simple in structure, and adequately lubricatedover a long period time.

It is an object of the invention to provide a motor-compressor unitfulfilling the above requisites and which is highly eflicient inoperation.

Further objects and advantages will heapparent from the followingdescription taken in connection with the accompanying drawmounted as aunit on a frame 18 supported tocooper 1 50 or lugs 22 and bolts 23.

ings wherein V Fig. 1 is an elevation partly'in vertical section showingan hermetically sealed motorcompressor unit contemplated by thisinvention;

Fig. 2, a detail section of the cross-head and yoke taken on line 2-2 ofFig. 1;

Fig. 3, a view similar to that of Fig. 1 but at right angles thereto;

Fig. 4, a detail section and driving arrangement of the compressor takenon the line Fig. 5, a detail section of the compressor valge plate taken'on the line 5-5 of Fig. 1; an

Fig. 6, a longitudinal section through the vertically supportedcompressor exhaust mufiier.

Referring to Fig. 1, a compressor is driven by a vertical electricmotorll through a crank 12 journaled in a cylindrical crosshead 13reciprocable in a tubular yoke-14 to w ich the cylinder of thecompressor 10 is attached. The compressor and the motor. age

5' upstanding lugs 16 on the crank-case adapted to with and fit intorecesses 17 in the frame 18, the recesses being lined with sounddeadening material 19. A dome or cover provided with heat radiating fins21 is secured to the crank-case by a. retaining ring ton 26 is Serial1%. 512,312.

The electrical connections to the motor are made through the crank-caseby means of fluid tight insulating bushings 24 of dielectric material.The jointbetween the crank-case 15 and the dome is made fluid tight andthe interior of the casing is exhausted of air and moisture and utilizedas part of the'low pressure side of the refrigerant circulation system,being connected to the evaporator f through a conduit 25 whichterminates within the casing at 26 as shown in Flg. 3.

The compressor, shown in detail in Fig. 4, includes .a stationarypiston, 26 removably mounted in the frame extension 27 of the frame 18and is held therein by the valve plate 31. In one end of the piston ismounted a check valve 28 which cooperates with a removable valve seat 26for normally closing a passage 29 through the length of. the piston,said valve being unseatable by the action of the compressor. The passage29 communicates with the exhaust port 30 in a valve plate 31 which isalso attached to the extension 27 of the motor frame. The compressorcylinder 32 cooperating with the pisattached to or made integral with atubular yoke 14 and is provided with an intake port 33.

The vertical hollow shaft 34 having at its lower end an eccentricportion or crank 12 and a counterbalance 35. The crank 12 is journaledinthe cross-head 13 which reciprocates in the tubular yoke 14. vApassageway 36 in the cross-head 13 communicates at one end with anintake pipe 37 attached to the cross-head and extending into the chamberwithin the compressor casing and the other end of passage 36 cooperateswith the yoke to open and close intake port 33 in a cylinder 32responsive to the reciprocating movement of the cross-head in the yoke.

As shown in Fig. 5 the valve plate 31 is provided with a passage 38communicating at one end with the compressor exhaust port 30 and openedand closed by a check'valve 39. A passage 40 opening into the passage 38between the exhaust port 30 and the check valve 39 is opened andclosedto the interior of the sealed casing by valve 41 operated by motor11 is provided with a a in ago X of the electric motor as shown in Flg.l. The purpose of the valve 41 is to equalize the compressor pistonuntil the motor comes up to operating speed at starting.

The exhaust passage 38 in the valve plate 31 communicates with thecondenser connection 43 through check valve 39 and a M mufier n as shownin lli s. 3 and 6. The mufier 44 comprises an en arged chamber toloafied by a series of felt or other orous material disks 46 held inplace by per orated metallic disks 427.

In order to afiord lubrication for the moving parts of themotor-compressor there is provided a pum operated by the relative motionbetween t e cross-head and yoke. As shown in Figs. 2 and t a c lindricalpump 39 chamber 48 in the cross-hea 13 opens at one end at the bearingsurface of the crank 12 and receives a piston 49 attached to anextensionor bridge 50 over the end of the tubular yoke 14. It is not necessarythat the parts of the oil pump be arranged as shown, but the piston maybe on the cross-head and the cylinder in the yoke, or any arrangementwhereby the pump is operated by the relative motion in the cross-headand yoke drive. Oil is drawn into the pump chamber 48 from the bottom ofthe crank-case 15 through a pipe 51 attached to the lower end of theeccentric crank 12 and communicating with ,intake valve opening 52 inthe crank 12 through a passage 53. Uil is forced from the pump cylinder48 through the outlet valve opening 54 and passage 55 in the eccentriccrank 12 into the hollow motor shaft 34: from where it may bedistributed to the motor hearw ing in any desired manner as, forinstance, through small radial ducts in the shaft. In operation, gas isdrawn into the compressor through pipe 37, passage 36 and intake port33. An additional port 56 may be I 4 3 provided in the cylinder 32 toinsure a complete charge of as before the start of the compression stroe. The compressed gas is discharged through check valve 28, passage.

29, port 30, passage 38, check valve 39 and mufier it into the line t3which is adapted to he connected to the condenser in a refrlgeratingsystem. Sound of the as discharge through valve 39 is maimed hy-t esmoothing action on the gas flow of the felt disks 4:6. in the mufier44:.

It will he obvious to those skilled in the art that various otherchanges may be made in the construction and arrangement withoutdeparting from the spirit of the invention and therefore the inventionis not limited to what is shown in the drawings and described in thespecification but only as indicated in the appended claims.

We claim:

t3 1. A. motor-compressor unit including a afietic device 42 responsiveto the leak-- pressures on both sides of the intense casing, a framesupported within said casing, a compressor mounted on said frame andcomprising a stationary piston and a reciprocable cylinder, a motor alsomounted on said frame and havinga hollow shaft with ducts leading fromthe interior of the shaft to the motor bearing surfaces, a yoke attachedto the compressor cylinder, a crosshermetically scale casing, a framesupport-.

ed within said casing, a compressor mounted on said frame and comprisinga stationary piston and a reciprocable cylinder, a vertical motor alsomounted on said frame and having a hollow shaft with radial ductsleading from the interior of the shaft to the motor bearing surfaces, atubular yoke attached to the compressor cylinder, a c lindricalcrosshead reciprocable in said yo e and having a valve opening adaptedto cooperate with the compressor intake port, a pump comprising acylinder formed in the cross-head and a piston attached to the yoke, acrank on the motor shaft journaledin the cross-head and having intakeand discharge valve openings for said pump, the discharge openingcommunicating with the interior of the motor shaft, and the intakeopening communicating with an intake pipe connected to the crank.

3. A motor-compressor unit including an hermetically sealed casing, aframe support! ed within said casing, a compressor mounted on said frameand comprising a stationary piston and a reciprocable cylinder,'avertical motoralso mounted on said frame and having a hollow shaft withradial ducts leading from the interior of the shaft to the motor bearingsurfaces, a tubular yoke attached to the compressor cylinder, a clindrical crosshead recipro'cable in said yo e and, having a valveopening adapted to cooperate. with the compressor intake port, a pumpcomprising a cylinder formed in the cross-head and a piston attached tothe yoke, a crank onthe motor shaft journaled in the cross-head andhaving intake and discharge valve openings for said pump, the dischargeopening communicating with the interior of the motor shaft and theintake opening communicating with an intake pipe connected to the crank,a mufier in the discharge line of the compressor, and an unloader valvefor said compressor.

4:. A motor-compressor unit including a lid ' er and arranged to beoperated by said casing, a vapor intake line communicating with thechamber enclosed by said casing, a frame removably mounted within saidcasing, noise deadening supports for said frame, a motor mounted on saidframe, a compressor also mounted on said frame, a yoke and crossheaddrive between the motor and the compresser and a pump operated by therelative movement in said drive, the cross-head having a passage adaptedto cooperate with the intake port of the compressor.

5. A motor-compressor unit including a casing, a'vapor intake linecommunicating with the chamber enclosed by said casing, a frameremovably mounted within said casing, noise deadening supports for saidframe, a motor mounted on said frame, a compressor also mounted on saidframe, a yoke and crosshead drive between the motor and the compressor,a pump operated by the relative movement in said drive, the cross-headhaving a passage adapted to cooperate withthe intake port of thecompressor and. a mufller in'the discharge line of said compressor.

- 6. In a motor-compressor unit, a yoke and cross-head drive between themotor and compressor, and a lubricant pump operated by the relativemotion in said drive, the crosshead having a passage adapted tocooperate with the compressor intake port.

7. The combination of a crank, reciprocating pumps located at rightangles to each otha cross-head rotatably mounted on said crank, a yokeslidably mounted on said cross-head,

g valve passages in said crank for controlling the admission anddischarge of fluid to one 1 of said pumps, and a valve passage in saidcross-head for controlling the admission of fluid to another of saidpumps.

8. In combination, a reciprocating compressor, a yoke integral with themovable element of said compressor, a cross-head adapted to reciprocatein said yoke, a pump chamber in said cross-head, and a piston adapted toreciprocate in said pump chamber and connected to said yoke.

9. A motor-compressor unit comprising a reciprocating compressor, acounter-balanced crank, a motor for driving said crank, a crosshead andyoke drive between said crank and said compressor, a pump adapted to beoperated by the relative motion in the cross-head and yoke drive, afluid tight casing around said motor and compressor, said pumpcommunicating with the lower portion of the chamber enclosed by saidcasing, and an outlet port for said pump communicating with passageswhich lead to the moving parts of said motor-compressor.

10. In a motor driven reciprocatory mechanism, a yoke and cross-headdrive between the motor and reciprocatory mechanism, and cooperatingpump elements constituted by crank,

portions of said cross-head and said yoke' and driven by thereciprocatory motion of the cross-head with respect to the yoke.

11. In combination, a reciprocatory mec anism, a driving motor for saidmechanism having a-crank, a yokeland cross-head drive between the crankand said mechanism, and an oil pump driven by the reciprocatory motionof the cross-head with respect to the yoke, said crank having intake anddischarge valve openings for the .oil pump.

12. The combination of a crank,-a reciproeating campressor, a cross-headand yoke drive" between said crank and said compressor, and an oil pumpdriven by the relative movement of the cross-head with respect to theyoke, said crank charge valve passages for said oil pump and thecross-head having a passage adapted -to cooperate with the intake portofsaid compressor.

In testimony whereof we afiix our signatures.

CLYDE E. PLOEGER. ALVIN E. BURGESS. WALTER 1A,. KUENZLI.

an inlet port for I having intake'and dis-

